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Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr_(0.8)Y_(0.2)O_(3 – Δ)

Kim, E. and Yamazaki, Y. and Haile, S. M. and Yoo, H.-I. (2015) Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr_(0.8)Y_(0.2)O_(3 – Δ). Solid State Ionics, 275 . pp. 23-28. ISSN 0167-2738. https://resolver.caltech.edu/CaltechAUTHORS:20150619-135533063

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Abstract

The influence of NiO, used as a sintering aid, on the transport properties of BaZr_(0.8)Y_(0.2)O_(3 – Δ) was investigated by monitoring electrical conductivity relaxation of specimens with and without NiO during hydration in atmospheres of different oxygen activities at 700 and 800 °C. The chemical diffusivities of H and O governing the kinetics were precisely evaluated from the transient conductivity, and all the defect-chemical parameters — the two external equilibrium constants and mobilities of all the carriers, VO· ·, Hi· and h· — were determined from the steady-state equilibrium conductivity. It is found that the processing benefits afforded by NiO are accompanied by a significant reduction in ionic mobilities and hydration reaction constant. These factors, in turn, result in a smaller electrolytic regime in the presence of NiO than when it is absent.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.ssi.2015.01.001DOIArticle
http://www.sciencedirect.com/science/article/pii/S0167273815000132PublisherArticle
ORCID:
AuthorORCID
Haile, S. M.0000-0002-5293-6252
Alternate Title:Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr0.8Y0.2O3 − Δ
Additional Information:© 2015 Elsevier B.V. Received 18 October 2014; Received in revised form 11 December 2014; Accepted 9 January 2015; Available online 28 January 2015.
Subject Keywords:BaZrO3; NiO sintering aid; Proton conductors; Hydration kinetics; Carrier mobility; Electrolytic domain
Record Number:CaltechAUTHORS:20150619-135533063
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150619-135533063
Official Citation:E. Kim, Y. Yamazaki, S.M. Haile, H.-I. Yoo, Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr0.8Y0.2O3 − Δ, Solid State Ionics, Volume 275, July 2015, Pages 23-28, ISSN 0167-2738, http://dx.doi.org/10.1016/j.ssi.2015.01.001. (http://www.sciencedirect.com/science/article/pii/S0167273815000132)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58381
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Jun 2015 21:43
Last Modified:03 Oct 2019 08:35

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